//
//  WBOAuthViewController.swift
//  仿微博
//
//  Created by apple on 2016/12/22.
//  Copyright © 2016年 apple. All rights reserved.
//

import UIKit
import SVProgressHUD
/// 通过 webView加载新浪微博授权页面控制器
class WBOAuthViewController: UIViewController {
   private lazy var webView = UIWebView()
    
    override func loadView() {
        view = webView
        //设置代理
        webView.delegate = self
        view.backgroundColor = UIColor.white
        //取消滚动视图
        webView.scrollView.isScrollEnabled = false
        //设置导航栏
        title = "登录新浪微博"
        //导航栏按钮
        navigationItem.leftBarButtonItem = UIBarButtonItem(title: "返回", fontSize: 14, target: self, action: #selector(close), isBack: true)
        
     navigationItem.rightBarButtonItem = UIBarButtonItem(title: "自动填充", fontSize: 14, target: self, action: #selector(autoFill), isBack: false)
    }
    
    
    override func viewDidLoad() {
        super.viewDidLoad()
        //加载授权页面
         let urlString = "https://api.weibo.com/oauth2/authorize?client_id=\(WBAppKey)&redirect_uri=\(WBredirectUrl)"
        
        //1.url 确定要访问的资源
        guard let url = URL(string: urlString) else {
        return
        }
        //2.建立请求
        let request = URLRequest(url: url)
        //3.加载请求
        webView.loadRequest(request)
        
        
        
        
        
    }

    // MARK: - 监听方法
      @objc fileprivate func close() {
        SVProgressHUD.dismiss()
        dismiss(animated: true, completion: nil)
    }
    // MARK: - 自动填充
    @objc private func autoFill() {
//        let js = "document.getElementById('userId').value = '276675358@qq.com';" + "document.getElementById('passwd').value = 'meng1130uitf';"
        let js = "document.getElementById('userId').value = '510080500@qq.com';" + "document.getElementById('passwd').value = 'Yangdawei870430';"
       webView.stringByEvaluatingJavaScript(from: js)
    }

   
}


// MARK: - <#UIWebViewDelegate#>
extension WBOAuthViewController: UIWebViewDelegate {
    
    /// webView 将要加载请求
    ///
    /// - Parameters:
    ///   - webView:         webView
    ///   - request:         要加载的请求
    ///   - navigationType:  导航类型
    /// - Returns: 是否加载 request
    func webView(_ webView: UIWebView, shouldStartLoadWith request: URLRequest, navigationType: UIWebViewNavigationType) -> Bool {
        //确认思路：
        //1.如果请求地址包含  http://baidu.com 不加载页面 / 否则加载页面
//        request.url?.absoluteString.hasPrefix(WBredirectUrl) 返回的是可选项  true/falae/nil
        if request.url?.absoluteString.hasPrefix(WBredirectUrl) == false {
        
        return true
        }
//        print("加载请求 ----\(request.url?.absoluteString)")
//        print("加载请求 ----\(request.url?.query)")
        //2. 从 http://baidu.com 回调地址的“查询字符串”中查找 “code=”
        //如果有， 授权成功， 否则， 授权失败
        if request.url?.query?.hasPrefix("code=") == false {
            print("取消授权")
            close()
         return false
        
        }
        //3.从 query中取出授权码
        let code = request.url?.query?.substring(from: "code=".endIndex) ?? ""
        print("获得授权  \(code)")
        
        
        //使用code得到AccessToken
        WBNetworkManager.shared().loadAccessToken(code: code) { (isSuccess) in
            if !isSuccess {
            SVProgressHUD.showInfo(withStatus: "网络请求失败")
            
            }else{
            
//             SVProgressHUD.showInfo(withStatus: "登录成功")
             // 下一步做什么？ 跳转’页面‘， 通过通知发送登录成功消息
                //1.发送通知, 不关心有没有监听者
            
                NotificationCenter.default.post(name: NSNotification.Name(rawValue: WBUserLoginSuccessedNotification), object: nil)
                //2.关闭窗
                self.close()
                //3.
                
            }
            
            
        }
        return false
    }

    
    func webViewDidStartLoad(_ webView: UIWebView) {
        SVProgressHUD.show()
    }
    
    func webViewDidFinishLoad(_ webView: UIWebView) {
        SVProgressHUD.dismiss()
    }
}
